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/*

 * Mesa 3-D graphics library

 *

 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 */

/**

 * \file state.c

 * State management.

 *

 * This file manages recalculation of derived values in struct gl_context.

 */

#include "glheader.h"

#include "mtypes.h"

#include "arrayobj.h"

#include "context.h"

#include "debug.h"

#include "macros.h"

#include "ffvertex_prog.h"

#include "framebuffer.h"

#include "light.h"

#include "matrix.h"

#include "pixel.h"

#include "program/program.h"

#include "program/prog_parameter.h"

#include "shaderobj.h"

#include "state.h"

#include "stencil.h"

#include "texenvprogram.h"

#include "texobj.h"

#include "texstate.h"

#include "varray.h"

#include "viewport.h"

#include "blend.h"

/**

 * Update the following fields:

 *   ctx->VertexProgram._Enabled

 *   ctx->FragmentProgram._Enabled

 *   ctx->ATIFragmentShader._Enabled

 * This needs to be done before texture state validation.

 */

static void

update_program_enables(struct gl_context *ctx)

{

   /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment

    * program is enabled AND valid.  Similarly for ATI fragment shaders.

    * GLSL shaders not relevant here.

    */

   ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled

      && ctx->VertexProgram.Current->Base.Instructions;

   ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled

      && ctx->FragmentProgram.Current->Base.Instructions;

   ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled

      && ctx->ATIFragmentShader.Current->Instructions[0];

}

/**

 * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point

 * to the current/active programs.  Then call ctx->Driver.BindProgram() to

 * tell the driver which programs to use.

 *

 * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment

 * programs or programs derived from fixed-function state.

 *

 * This function needs to be called after texture state validation in case

 * we're generating a fragment program from fixed-function texture state.

 *

 * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex

 * or fragment program is being used.

 */

static GLbitfield

update_program(struct gl_context *ctx)

{

   const struct gl_shader_program *vsProg =

      ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];

   const struct gl_shader_program *gsProg =

      ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];

   struct gl_shader_program *fsProg =

      ctx->_Shader->CurrentProgram[MESA_SHADER_FRAGMENT];

   const struct gl_shader_program *csProg =

      ctx->_Shader->CurrentProgram[MESA_SHADER_COMPUTE];

   const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;

   const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;

   const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;

   const struct gl_compute_program *prevCP = ctx->ComputeProgram._Current;

   GLbitfield new_state = 0x0;

   /*

    * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current

    * pointers to the programs that should be used for rendering.  If either

    * is NULL, use fixed-function code paths.

    *

    * These programs may come from several sources.  The priority is as

    * follows:

    *   1. OpenGL 2.0/ARB vertex/fragment shaders

    *   2. ARB/NV vertex/fragment programs

    *   3. Programs derived from fixed-function state.

    *

    * Note: it's possible for a vertex shader to get used with a fragment

    * program (and vice versa) here, but in practice that shouldn't ever

    * come up, or matter.

    */

   if (fsProg && fsProg->LinkStatus

       && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {

      /* Use GLSL fragment shader */

      _mesa_reference_shader_program(ctx,

                                     &ctx->_Shader->_CurrentFragmentProgram,

				     fsProg);

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,

                               gl_fragment_program(fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,

			       NULL);

   }

   else if (ctx->FragmentProgram._Enabled) {

      /* Use user-defined fragment program */

      _mesa_reference_shader_program(ctx,

                                     &ctx->_Shader->_CurrentFragmentProgram,

				     NULL);

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,

                               ctx->FragmentProgram.Current);

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,

			       NULL);

   }

   else if (ctx->FragmentProgram._MaintainTexEnvProgram) {

      /* Use fragment program generated from fixed-function state */

      struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);

      _mesa_reference_shader_program(ctx,

                                     &ctx->_Shader->_CurrentFragmentProgram,

				     f);

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,

			       gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,

			       gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));

   }

   else {

      /* No fragment program */

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,

			       NULL);

   }

   if (gsProg && gsProg->LinkStatus

       && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {

      /* Use GLSL geometry shader */

      _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,

			       gl_geometry_program(gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program));

   } else {

      /* No geometry program */

      _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);

   }

   /* Examine vertex program after fragment program as

    * _mesa_get_fixed_func_vertex_program() needs to know active

    * fragprog inputs.

    */

   if (vsProg && vsProg->LinkStatus

       && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {

      /* Use GLSL vertex shader */

      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,

			       gl_vertex_program(vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program));

   }

   else if (ctx->VertexProgram._Enabled) {

      /* Use user-defined vertex program */

      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,

                               ctx->VertexProgram.Current);

   }

   else if (ctx->VertexProgram._MaintainTnlProgram) {

      /* Use vertex program generated from fixed-function state */

      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,

                               _mesa_get_fixed_func_vertex_program(ctx));

      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,

                               ctx->VertexProgram._Current);

   }

   else {

      /* no vertex program */

      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);

   }

   if (csProg && csProg->LinkStatus

       && csProg->_LinkedShaders[MESA_SHADER_COMPUTE]) {

      /* Use GLSL compute shader */

      _mesa_reference_compprog(ctx, &ctx->ComputeProgram._Current,

                               gl_compute_program(csProg->_LinkedShaders[MESA_SHADER_COMPUTE]->Program));

   } else {

      /* no compute program */

      _mesa_reference_compprog(ctx, &ctx->ComputeProgram._Current, NULL);

   }

   /* Let the driver know what's happening:

    */

   if (ctx->FragmentProgram._Current != prevFP) {

      new_state |= _NEW_PROGRAM;

      if (ctx->Driver.BindProgram) {

         ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,

                          (struct gl_program *) ctx->FragmentProgram._Current);

      }

   }

   if (ctx->GeometryProgram._Current != prevGP) {

      new_state |= _NEW_PROGRAM;

      if (ctx->Driver.BindProgram) {

         ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,

                            (struct gl_program *) ctx->GeometryProgram._Current);

      }

   }

   if (ctx->VertexProgram._Current != prevVP) {

      new_state |= _NEW_PROGRAM;

      if (ctx->Driver.BindProgram) {

         ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,

                            (struct gl_program *) ctx->VertexProgram._Current);

      }

   }

   if (ctx->ComputeProgram._Current != prevCP) {

      new_state |= _NEW_PROGRAM;

      if (ctx->Driver.BindProgram) {

         ctx->Driver.BindProgram(ctx, GL_COMPUTE_PROGRAM_NV,

                                 (struct gl_program *) ctx->ComputeProgram._Current);

      }

   }

   return new_state;

}

/**

 * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.

 */

static GLbitfield

update_program_constants(struct gl_context *ctx)

{

   GLbitfield new_state = 0x0;

   if (ctx->FragmentProgram._Current) {

      const struct gl_program_parameter_list *params =

         ctx->FragmentProgram._Current->Base.Parameters;

      if (params && params->StateFlags & ctx->NewState) {

         new_state |= _NEW_PROGRAM_CONSTANTS;

      }

   }

   if (ctx->GeometryProgram._Current) {

      const struct gl_program_parameter_list *params =

         ctx->GeometryProgram._Current->Base.Parameters;

      /*FIXME: StateFlags is always 0 because we have unnamed constant

       *       not state changes */

      if (params /*&& params->StateFlags & ctx->NewState*/) {

         new_state |= _NEW_PROGRAM_CONSTANTS;

      }

   }

   if (ctx->VertexProgram._Current) {

      const struct gl_program_parameter_list *params =

         ctx->VertexProgram._Current->Base.Parameters;

      if (params && params->StateFlags & ctx->NewState) {

         new_state |= _NEW_PROGRAM_CONSTANTS;

      }

   }

   return new_state;

}

/**

 * Update the ctx->Polygon._FrontBit flag.

 */

static void

update_frontbit(struct gl_context *ctx)

{

   if (ctx->Transform.ClipOrigin == GL_LOWER_LEFT)

      ctx->Polygon._FrontBit = (ctx->Polygon.FrontFace == GL_CW);

   else

      ctx->Polygon._FrontBit = (ctx->Polygon.FrontFace == GL_CCW);

}

/**

 * Update derived multisample state.

 */

static void

update_multisample(struct gl_context *ctx)

{

   ctx->Multisample._Enabled = GL_FALSE;

   if (ctx->Multisample.Enabled &&

       ctx->DrawBuffer &&

       ctx->DrawBuffer->Visual.sampleBuffers)

      ctx->Multisample._Enabled = GL_TRUE;

}

/**

 * Update the ctx->VertexProgram._TwoSideEnabled flag.

 */

static void

update_twoside(struct gl_context *ctx)

{

   if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX] ||

       ctx->VertexProgram._Enabled) {

      ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;

   } else {

      ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&

					    ctx->Light.Model.TwoSide);

   }

}

/**

 * Compute derived GL state.

 * If __struct gl_contextRec::NewState is non-zero then this function \b must

 * be called before rendering anything.

 *

 * Calls dd_function_table::UpdateState to perform any internal state

 * management necessary.

 *

 * \sa _mesa_update_modelview_project(), _mesa_update_texture(),

 * _mesa_update_buffer_bounds(),

 * _mesa_update_lighting() and _mesa_update_tnl_spaces().

 */

void

_mesa_update_state_locked( struct gl_context *ctx )

{

   GLbitfield new_state = ctx->NewState;

   GLbitfield prog_flags = _NEW_PROGRAM;

   GLbitfield new_prog_state = 0x0;

   if (new_state == _NEW_CURRENT_ATTRIB)

      goto out;

   if (MESA_VERBOSE & VERBOSE_STATE)

      _mesa_print_state("_mesa_update_state", new_state);

   /* Determine which state flags effect vertex/fragment program state */

   if (ctx->FragmentProgram._MaintainTexEnvProgram) {

      prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |

		     _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |

		     _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |

		     _NEW_COLOR);

   }

   if (ctx->VertexProgram._MaintainTnlProgram) {

      prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE |

                     _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |

                     _NEW_FOG | _NEW_LIGHT |

                     _MESA_NEW_NEED_EYE_COORDS);

   }

   /*

    * Now update derived state info

    */

   if (new_state & prog_flags)

      update_program_enables( ctx );

   if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))

      _mesa_update_modelview_project( ctx, new_state );

   if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))

      _mesa_update_texture( ctx, new_state );

   if (new_state & _NEW_POLYGON)

      update_frontbit( ctx );

   if (new_state & _NEW_BUFFERS)

      _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);

   if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))

      _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);

   if (new_state & _NEW_LIGHT)

      _mesa_update_lighting( ctx );

   if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))

      update_twoside( ctx );

   if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))

      _mesa_update_stencil( ctx );

   if (new_state & _NEW_PIXEL)

      _mesa_update_pixel( ctx, new_state );

   if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))

      update_multisample( ctx );

   /* ctx->_NeedEyeCoords is now up to date.

    *

    * If the truth value of this variable has changed, update for the

    * new lighting space and recompute the positions of lights and the

    * normal transform.

    *

    * If the lighting space hasn't changed, may still need to recompute

    * light positions & normal transforms for other reasons.

    */

   if (new_state & _MESA_NEW_NEED_EYE_COORDS)

      _mesa_update_tnl_spaces( ctx, new_state );

   if (new_state & prog_flags) {

      /* When we generate programs from fixed-function vertex/fragment state

       * this call may generate/bind a new program.  If so, we need to

       * propogate the _NEW_PROGRAM flag to the driver.

       */

      new_prog_state |= update_program( ctx );

   }

   if (new_state & _NEW_ARRAY)

      _mesa_update_vao_client_arrays(ctx, ctx->Array.VAO);

 out:

   new_prog_state |= update_program_constants(ctx);

   /*

    * Give the driver a chance to act upon the new_state flags.

    * The driver might plug in different span functions, for example.

    * Also, this is where the driver can invalidate the state of any

    * active modules (such as swrast_setup, swrast, tnl, etc).

    *

    * Set ctx->NewState to zero to avoid recursion if

    * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)

    */

   new_state = ctx->NewState | new_prog_state;

   ctx->NewState = 0;

   ctx->Driver.UpdateState(ctx, new_state);

   ctx->Array.VAO->NewArrays = 0x0;

}

/* This is the usual entrypoint for state updates:

 */

void

_mesa_update_state( struct gl_context *ctx )

{

   _mesa_lock_context_textures(ctx);

   _mesa_update_state_locked(ctx);

   _mesa_unlock_context_textures(ctx);

}

/**

 * Want to figure out which fragment program inputs are actually

 * constant/current values from ctx->Current.  These should be

 * referenced as a tracked state variable rather than a fragment

 * program input, to save the overhead of putting a constant value in

 * every submitted vertex, transferring it to hardware, interpolating

 * it across the triangle, etc...

 *

 * When there is a VP bound, just use vp->outputs.  But when we're

 * generating vp from fixed function state, basically want to

 * calculate:

 *

 * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |

 *                 potential_vp_outputs )

 *

 * Where potential_vp_outputs is calculated by looking at enabled

 * texgen, etc.

 *

 * The generated fragment program should then only declare inputs that

 * may vary or otherwise differ from the ctx->Current values.

 * Otherwise, the fp should track them as state values instead.

 */

void

_mesa_set_varying_vp_inputs( struct gl_context *ctx,

                             GLbitfield64 varying_inputs )

{

   if (ctx->varying_vp_inputs != varying_inputs) {

      ctx->varying_vp_inputs = varying_inputs;

      /* Only the fixed-func generated programs need to use the flag

       * and the fixed-func fragment program uses it only if there is also

       * a fixed-func vertex program, so this only depends on the latter.

       *

       * It's okay to check the VP pointer here, because this is called after

       * _mesa_update_state in the vbo module. */

      if (ctx->VertexProgram._TnlProgram ||

          ctx->FragmentProgram._TexEnvProgram) {

         ctx->NewState |= _NEW_VARYING_VP_INPUTS;

      }

      /*printf("%s %x\n", __func__, varying_inputs);*/

   }

}

/**

 * Used by drivers to tell core Mesa that the driver is going to

 * install/ use its own vertex program.  In particular, this will

 * prevent generated fragment programs from using state vars instead

 * of ordinary varyings/inputs.

 */

void

_mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)

{

   if (ctx->VertexProgram._Overriden != flag) {

      ctx->VertexProgram._Overriden = flag;

      /* Set one of the bits which will trigger fragment program

       * regeneration:

       */

      ctx->NewState |= _NEW_PROGRAM;

   }

}